using System.Text.Json;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Tiku.Application.Content;
using Tiku.Domain.Content;
using Tiku.Domain.Learning;
using Tiku.Domain.Tenancy;
using Tiku.Infrastructure.Persistence;
using Tiku.IntegrationTests.Api;

namespace Tiku.IntegrationTests.ContentV2;

public sealed class ContentReleaseCompilerTests
{
    [Fact]
    public async Task Publishing_new_revision_creates_new_release_without_mutating_old_delivery()
    {
        await using var factory = new ApiTestFactory();
        var fixture = await SeedAsync(factory);
        using var scope = factory.CreateSystemScope("Compile immutable V2 releases");
        var compiler = scope.ServiceProvider.GetRequiredService<IContentReleaseCompiler>();
        var authoring = scope.ServiceProvider.GetRequiredService<IContentV2AuthoringService>();

        var first = await compiler.PublishAsync(new PublishContentReleaseCommand(
            fixture.TenantId,
            fixture.ActorUserId,
            fixture.CurriculumVersionId,
            "Release 1"));
        var revised = await authoring.CreateRevisionAsync(
            new ContentAuthorActor(fixture.TenantId, fixture.ActorUserId),
            fixture.QuestionAssetId,
            Draft("2 + 2 = ?", 1),
            true);
        var second = await compiler.PublishAsync(new PublishContentReleaseCommand(
            fixture.TenantId,
            fixture.ActorUserId,
            fixture.CurriculumVersionId,
            "Release 2"));

        var db = scope.ServiceProvider.GetRequiredService<TikuDbContext>();
        var firstQuestion = await db.ContentReleaseQuestions.AsNoTracking()
            .SingleAsync(item => item.ContentReleaseId == first.ContentReleaseId);
        var secondQuestion = await db.ContentReleaseQuestions.AsNoTracking()
            .SingleAsync(item => item.ContentReleaseId == second.ContentReleaseId);
        Assert.Equal(1, first.ReleaseNo);
        Assert.Equal(2, second.ReleaseNo);
        Assert.Equal(fixture.QuestionRevisionId, firstQuestion.QuestionRevisionId);
        Assert.Equal(revised.QuestionRevisionId, secondQuestion.QuestionRevisionId);
        Assert.NotEqual(firstQuestion.QuestionRevisionId, secondQuestion.QuestionRevisionId);
        Assert.Equal(2, await db.LearningOutboxMessages.CountAsync(item =>
            item.EventType == "content_release_published"));
        Assert.All(await db.ContentReleases.AsNoTracking().ToArrayAsync(), release =>
            Assert.Equal(ContentReleaseStatus.Published, release.Status));
    }

    private static async Task<CompilerFixture> SeedAsync(ApiTestFactory factory)
    {
        var tenantId = Guid.NewGuid();
        var platformOwnerId = Guid.NewGuid();
        var actorUserId = Guid.NewGuid();
        var businessLineId = Guid.NewGuid();
        var profileId = Guid.NewGuid();
        var curriculumId = Guid.NewGuid();
        var curriculumVersionId = Guid.NewGuid();
        var curriculumNodeId = Guid.NewGuid();
        var policyId = Guid.NewGuid();
        var policyVersionId = Guid.NewGuid();
        var questionAssetId = Guid.NewGuid();
        var questionRevisionId = Guid.NewGuid();
        var placementId = Guid.NewGuid();
        var now = DateTimeOffset.UtcNow;
        var draft = Draft("1 + 1 = ?", 0);
        var fingerprint = QuestionDeliveryFingerprint.Compute(ToFingerprintInput(draft));

        await factory.SeedAsync(
            new Tenant
            {
                Id = platformOwnerId,
                Slug = $"platform-{platformOwnerId:N}",
                Name = "Platform owner",
                Mode = TenantMode.PlatformOwned
            },
            new Tenant
            {
                Id = tenantId,
                Slug = $"tenant-{tenantId:N}",
                Name = "V2 compiler tenant"
            },
            new BusinessLine
            {
                Id = businessLineId,
                Code = $"business-{businessLineId:N}",
                Name = "Extensible exam business"
            },
            new ExamTargetProfile
            {
                Id = profileId,
                BusinessLineId = businessLineId,
                Code = $"profile-{profileId:N}",
                Name = "Profile"
            },
            new Curriculum
            {
                Id = curriculumId,
                TenantId = tenantId,
                BusinessLineId = businessLineId,
                Code = $"curriculum-{curriculumId:N}",
                Name = "Curriculum"
            },
            new AssessmentPolicy
            {
                Id = policyId,
                TenantId = tenantId,
                BusinessLineId = businessLineId,
                Code = $"policy-{policyId:N}",
                Name = "Policy"
            },
            new QuestionAsset
            {
                Id = questionAssetId,
                TenantId = tenantId,
                DeliveryFingerprint = fingerprint,
                Status = QuestionAssetStatus.Published,
                CreatedBy = actorUserId,
                UpdatedBy = actorUserId
            });
        await factory.SeedAsync(
            new ExamTargetProfileVersion
            {
                ExamTargetProfileId = profileId,
                DisplayName = "Profile 2027",
                Status = ContentDefinitionStatus.Published,
                PublishedAt = now
            },
            new CurriculumVersion
            {
                Id = curriculumVersionId,
                TenantId = tenantId,
                CurriculumId = curriculumId,
                Name = "Curriculum 2027",
                Status = ContentDefinitionStatus.Published,
                PublishedAt = now
            },
            new AssessmentPolicyVersion
            {
                Id = policyVersionId,
                TenantId = tenantId,
                AssessmentPolicyId = policyId,
                DefaultScore = 1,
                Status = ContentDefinitionStatus.Published,
                PublishedAt = now
            },
            new QuestionRevision
            {
                Id = questionRevisionId,
                TenantId = tenantId,
                QuestionAssetId = questionAssetId,
                QuestionType = draft.QuestionType,
                NormalizedContent = QuestionDeliveryFingerprint.NormalizePrompt(draft.Content),
                Content = draft.Content,
                Options = draft.Options,
                CorrectOptionIndex = draft.CorrectOptionIndex,
                DeliveryFingerprint = fingerprint,
                CreatedBy = actorUserId
            });
        await factory.SeedAsync(
            new CurriculumNode
            {
                Id = curriculumNodeId,
                TenantId = tenantId,
                CurriculumVersionId = curriculumVersionId,
                Code = "math",
                Name = "Math",
                Kind = CurriculumNodeKind.Subject
            });
        await factory.SeedAsync(
            new QuestionPlacement
            {
                Id = placementId,
                TenantId = tenantId,
                QuestionAssetOwnerTenantId = tenantId,
                QuestionAssetId = questionAssetId,
                CurriculumVersionId = curriculumVersionId,
                CurriculumNodeId = curriculumNodeId,
                AssessmentPolicyVersionId = policyVersionId,
                Status = QuestionPlacementStatus.Active,
                CreatedBy = actorUserId,
                UpdatedBy = actorUserId
            });
        using (var scope = factory.CreateSystemScope("Set current immutable revision"))
        {
            var db = scope.ServiceProvider.GetRequiredService<TikuDbContext>();
            await db.QuestionAssets.Where(item => item.Id == questionAssetId)
                .ExecuteUpdateAsync(setters => setters.SetProperty(item => item.CurrentRevisionId, questionRevisionId));
        }

        return new CompilerFixture(
            tenantId,
            actorUserId,
            curriculumVersionId,
            questionAssetId,
            questionRevisionId);
    }

    private static QuestionRevisionDraft Draft(string content, int correctOptionIndex) => new(
        "choice",
        null,
        2,
        content,
        JsonSerializer.SerializeToElement(new[] { "2", "4" }),
        correctOptionIndex,
        JsonSerializer.SerializeToElement(Array.Empty<int>()),
        null,
        "Explanation",
        JsonSerializer.SerializeToElement(Array.Empty<object>()),
        null,
        null);

    private static QuestionDeliveryFingerprintInput ToFingerprintInput(QuestionRevisionDraft draft) => new(
        draft.QuestionType,
        draft.Content,
        draft.Options,
        draft.CorrectOptionIndex,
        draft.CorrectOptionIndices,
        draft.AnswerText,
        draft.SubQuestions,
        draft.CodeLang,
        draft.CodeTemplate);

    private sealed record CompilerFixture(
        Guid TenantId,
        Guid ActorUserId,
        Guid CurriculumVersionId,
        Guid QuestionAssetId,
        Guid QuestionRevisionId);
}